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, @uws giant @anni @Him D. R. CLEM, OF FRONT ROYAL, VIRGIN-IA. Letters Patent No. 61,714, dated Ferztary 5, 18,67.

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TO.' ALL WHOM IT MAY CONCERN:

Be it known that I, D. R. CLEM, of Front Royal, in the county of Warren, and State of Virginia, have invented certain new and useful Improvements in Millstoue Drivers; and I do hereby declare that the followingr is a full, clear, and exact description thereof, reference being had to the accompanying drawings, makingvpart of this specification, and to the letters of reference marked thereon, like letters indicating like parts wherever they occur.

To enable othersA skilled in the art to construct and use the'invention, I will proceed to describe it.

My invention consists in constructing the driver of separate pieces, so pivoted and jointed that it will adjust itself, and thus drive the stone evenly and truly.

Figure l is a plan View; and

Figure 2, ahorizontal section.

It is customary to construct the ,driver of millstones of a single rigid piece of meta-l, having a hole in the centre for fastening it to the spindle, and having its ends resting in notches cut in thestone. When such a device is used, it is formed so that vcryfrequentlyithe ends resting i'n the notches wear unequally, and that when this occurs the stone is tilted. or tipped, so that it does not run ,evenly and truly, one side' being more or less raised, thus permitting the grain on that side to escape without being sufficiently ground, while on the oppositeside it is depressed, thereby grinding the flour too ineor close, and injuring its quality. To remedy these diilculties I construct my improved driver ofa central piece, A, which fits upon the spindle, and two arms or levers, B, as shown in the drawings. The central piece A is made in Vthe forml shown in iig. Q, and is connected at cach end by a link, b, to theparm B, about midway of its length. The arms B have thcirinner ends curved, so as to pass along by the side of A; and these inner ends are connectedby a ring, C, to which they are pivoted by pins c, as shown, there being duplicate rings, one on the upper and one on the lower side. By this method of uniting the arms B and the central piece A, it will be seen that the arms B will form levers, fulcrumed at a, and that when their outer ends move in either direction, as they are at liberty todo 'to a given extent, their inner ends will move together in the opposite direction.` The face of the outer cud of the arms B, where they press against the stone to give it i rotation, are rounded, and project slightly, as shown at m, the object of which is to permit the driver to adjust itself perfectly without binding in any way. By this method of constructing the driver it-adjusts itself perfectly, so that any unequal wear of the arms or the stone, where the two come in contact, will not tend to throw the stone out of line, or make it revolve irregularly; and thus I insure an even yand steady rotation of the stone by which means a uniform quality or grade of work is at all times produced, and the time required for refitting the parts is saved. Another beneiicinl result of the use of my'improved driver is, that if the spindle by any means gets moved at the toe, the driver adjusts itself in such a manner that the stone still runs true, keeping the grinding faces of the stones parallel and true, thereby saving wear and power, and insuring far more perfect operation.

Having thus described my invention, what I claim, isv'.lhe driver composed of`tl1e central piece A and the arms B, united and arranged to operate substantially as and for the purpose sct forth. n D. R. CLEM.

Witnesses:

P. T. Denen, H. B. Munn'. 

